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	Home  ▶ People   Current   Affiliates   Alumni   Visitors   Students  ▶ Research   ICAM-LANL  ▶ Publications   2007   2006   2005   2004   2003   2002   2001   2000   <1999  ▶ Conferences   Workshops   Sponsorship  ▶ Talks   Colloquia   Seminars   Quantum Lunch   CMS Colloquia   Archive   Kac Lectures   Dist. Quant. Lecture   Ulam Scholar   Colloquia     Jobs  ▶ Students   Summer Research   Graduate Positions  ▶ Visitors   Description  ▶ Services   General   PD Travel Request     History of CNLS     Maps, Directions   CNLS Office   T-Division   LANL				Thursday, August 04, 201110:00 AM - 11:00 AMCNLS Conference Room (TA-3, Bldg 1690) Seminar Stability and convergence for cell-centered Lagrangian schemes B. DespresJacques-Louis Lions Laboratory Lagrangian meshes are plagued with various pathologies (tangling, negative volume, ...), whatever the scheme used. In this second presentation I will focus on a priori stabilization of cell-centered Lagrangian schemes. It will be shown that pathologies of Lagrangian meshes can be analyzed with subzonal entropies which are kind of mixing entropies [1]. This subzonal entropy is added to the total entropy so that correction terms are designed to cell-centered Lagrangian schemes. The two main properties are: the scheme is still consistent in the mimetic sense, the mesh never crashes provided convenient time step is used. The low dissipativity Glace scheme takes huge advantage of this procedure. Test problems show the efficiency of the method. Host: Mikhail Shashkov. shashkov@lanl.gov, 667-4400